Determine the ph of the solution after the addition of hno3
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 100.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
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An absorbance of 0.395 at 460 nm is measured for a solution of compound A with an unknown concentration. If the same sized cuvette is used, what is the concentration of compound A in this solution?
A block falls from rest from the top of a 178-m-high building. When the block is 58.0 m above the ground, a man, 1.90 m tall, standing directly underneath, sees the block. How much time does he have to react to avoid being hit?
The second -order decomposition of NO2 has a rate constant of 0.255 M-1S-1. How long will it take for 75% of NO2 to decompose if the initial concentration of NO2 is 1.33M?
Calculate the amount of heat liberated (in kJ) from 421 g of mercury when it cools from 91.0°C to 11.0°C.
Given the absorbance spectrum of compound A below. At what wavelength does compound A most strongly absorb visible light?
Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to significant digits.
Glucose (C6H12O6) is oxidized by molecular oxygen to carbon dioxide and water. how many O2 molecules are needed for each molecule of glucose that is oxidized?
Discuss some of these major changes, by providing some detailed examples, and whether you think they have been successful in slowing rate of health care expenditures.
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